Quad Spinner:

The Quad Spinner is a heavy drum that is rotated at variable speed by propulsion of the thighs and feet. It promotes the cardiovascular fitness and strengthens the quadriceps and the abdominal area.
The quadraceps are the power driving muscles used to run, hike or generate forward motion. Try a variety of speeds forwards and backwards and maintain the exercise for several minutes, or more, to gain the cardiovascular benefits.

Installation Drawing (pdf)